<template>
  <div v-if="!item.hidden" class="menus-item">
    <template
        v-if="
        hasOneShowingChild(item.children, item) &&
        (!onlyOneChild.children || onlyOneChild.noShowingChildren) &&
        !item.alwaysShow
      "
    >
      <app-link v-if="onlyOneChild.meta" :to="resolvePath(onlyOneChild.path)">
        <el-menu-item
            :index="resolvePath(onlyOneChild.path)"
            :class="{ 'submenu-title-noDropdown': !isNest }"
        >
          <item
              :icon="onlyOneChild.meta.icon || (item.meta && item.meta.icon)"
              :title="onlyOneChild.meta.title"
          />
        </el-menu-item>
      </app-link>
    </template>

    <el-submenu
        v-else
        ref="subMenu"
        :index="resolvePath(item.path)"
        popper-append-to-body
    >
      <template slot="title">
        <item
    v-if="item.meta"
    :icon="item.meta && item.meta.icon"
    :title="item.meta.title"
  />
      </template>
      <menus-item
          v-for="child in item.children"
          :key="child.path"
          :is-nest="true"
          :item="child"
          :base-path="resolvePath(child.path)"
          class="nest-menu"
      />
    </el-submenu>
  </div>
</template>

<script>
import path from "path";
import {isExternal} from "./validate";
import Item from "./MenuItem.vue";
import AppLink from "./MenuLink.vue";
import FixiOSBug from "./FixiOSBug";

export default {
  name: "MenusItem",
  components: {Item, AppLink},
  mixins: [FixiOSBug],
  props: {
    // route object
    item: {
      type: Object,
      required: true,
    },
    isNest: {
      type: Boolean,
      default: false,
    },
    basePath: {
      type: String,
      default: "",
    },
  },
  data() {
    // To fix https://github.com/PanJiaChen/vue-admin-template/issues/237
    // TODO: refactor with render function
    this.onlyOneChild = null;
    return {};
  },
  methods: {
    hasOneShowingChild(children = [], parent) {
      const showingChildren = children.filter((item) => {
        if (item.hidden) {
          return false;
        } else {
          // Temp set(will be used if only has one showing child)
          this.onlyOneChild = item;
          return true;
        }
      });

      // When there is only one child router, the child router is displayed by default
      if (showingChildren.length === 1) {
        return true;
      }

      // Show parent if there are no child router to display
      if (showingChildren.length === 0) {
        this.onlyOneChild = {...parent, path: "", noShowingChildren: true};
        return true;
      }

      return false;
    },
    resolvePath(routePath) {
      if (isExternal(routePath)) {
        return routePath;
      }
      if (isExternal(this.basePath)) {
        return this.basePath;
      }
      return path.resolve(this.basePath, routePath);
    },
  },
};
</script>
